Gypsy moth was trapped in 13 counties in 

 Oregon andWashington in 1995. 



Table 4-1 — Gypsy moth eradication sites in 1996 



The Oregon Department of Agriculture keeps a 

 steady watch on the gypsy moth l}irough an 

 extensive trapping program. 



' Bt is a microbial insecticide, composed of the bacterium, Bacillus thuringiensis. 



few years, several Asian gypsy moths have been 

 trapped in Washington and British Columbia 

 and one in Oregon, near ports where they have 

 arrived on ships. 



The largest outbreak in the United States 

 was in 1984, followed by the largest control ef- 

 fort in 1985: 227,000 acres near Eugene, Or- 



egon, were treated with aerial applications of 

 Bacillus thuringiensis (Bt), a microbial insecti- 

 cide. In 1996, 10 sites in Oregon and Wash- 

 ington were treated with Bt to eradicate the 

 moth. Treatment areas are selected on the 

 basis of gypsy moth species (Asian or Euro- 

 pean), size of the population, and number of 



Urban— 63 



